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Struts bean:write tag

Posted on 2004-10-20
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Last Modified: 2013-12-29
I have this tag: <bean:write name="result"/> in one of my JSPs that is being accessed from 2 or more Action objects. One of those Action objects sets the message like so:

String message = "Successful";
request.setAttribute("result", message);

but the other Action objects dont set that bean (ie I don't need any message if it's coming from them), so when the JSP is being called from any of those Action objects, I get a JSP exception that "result" has never been set.

Is there any way around this problem other than setting a blank "result" message in every other Action that forwards to that JSP? What is the proper way of doing this? I don't want to use scripting in my JSP to check if "result" is null.

Thanks.
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Question by:Flavaflav
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7 Comments
 
LVL 8

Expert Comment

by:kiranhk
ID: 12363111
you can initialize ur bean variable to a default value so that in case it is not set by any action class it should display the default value
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LVL 8

Expert Comment

by:kiranhk
ID: 12363132
sorry abt the above quote

you can wrap ur bean write tag with the <logic:present> so that it will check out whether it is present and then display it if is there.
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Author Comment

by:Flavaflav
ID: 12363903
I tried doing this:

<logic:present><bean:write name="result"></logic:present>

but I get the following runtime exception: "No selector attribute (cookie/header/name/parameter) was specified".
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LVL 8

Expert Comment

by:kiranhk
ID: 12364039
try this out

<logic:present name="result">
<bean:write name="result"></
</logic:present>


also go thro this

http://struts.apache.org/api/org/apache/struts/taglib/logic/package-summary.html#package_description
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Author Comment

by:Flavaflav
ID: 12364370
Great thanks that worked. While we're on this subject I have another question: Using the bean:write tag, how can I get the property of a property of a bean? For example, I have:

<bean:write name="target" property="dataField">

where dataField is a DataField object belonging to the Target object, but I need to display a certain field from that DataField obj (eg. "description"). Is there a way to do this just using Struts tags, and w/out overriding toString() in DataField to return the description property?
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LVL 8

Accepted Solution

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kiranhk earned 100 total points
ID: 12364752
<bean:write name="target" property="dataField.urpropertyname">
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Author Comment

by:Flavaflav
ID: 12364930
Simple enough :>. Thanks.
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